Partials change with tension?...was Verituner Spinner

[Michael Gamble]

Hello Isaac OLEG
Those "tone improvements after pitch raising when tuned from 20cents above"
could you be a bit more explicit? When I tune (as I did yesterday) a piano
up to A=440 I follow my so called "quadrant system" which tunes quarter of
the piano from 40cents flat up to A=444 (I haven't computed this in terms of
cents yet) the next quarter up to A=443, the third quarter to 442 and the
last to A=441. By this time the piano is ready for a fine tune - and many
strings are OK already. I find the tone at A=440 greatly improved over the
tone "as found" (as it was before I started) and I'm wondering if my method
complies with observation.
Little story.
A concert pianist friend of mine bought a piano which was a semi-tone flat
and asked me if I would bring it up. So I did (as above) but before I
"brought up" the third and fourth quarters of the piano I challenged him to
play "any piece you want - and see how far you get" At this point the piano
sounds as if you're going down the whole-tone scale playing each note twice)
The result of my challenge was hilarious! He played just so-far into the
Beethoven then we both collapsed laughing fit to bust.  End of story.
Regards
Michael G (UK)